Anti-drilling lock cylinder

Abstract

The anti-drilling lock cylinder comprises a lock shell, a lock container is installed in the lock shell, a U-shaped anti-drilling piece is inserted into the lock container, the lock container comprises a sealing cover used for being connected with the lock shell in a sealed mode and a container body connected with the sealing cover, an inserting groove is formed between the sealing cover and the container body, the U-shaped anti-drilling piece is inserted into the inserting groove, and the shape of the U-shaped anti-drilling piece is matched with the shape of the inserting groove. A key hole is formed in the sealing cover, a key groove is formed in the container body in a penetrating mode, the U-shaped anti-drilling piece comprises a connecting part and a tooth groove part, the shape of the side section of the tooth groove part is the same as that of the side section of the key groove, and the cross section of the U-shaped anti-drilling piece is in a U shape. According to the U-shaped anti-drilling sheet, the anti-drilling area is increased, the anti-theft performance is better, and the U-shaped anti-drilling sheet is not prone to being damaged by drilling. And secondly, compared with the prior art that an exposed anti-drilling cover is directly arranged, the U-shaped anti-drilling piece is hidden between the container body of the lock container and the sealing cover, after the lock shell is installed, the installation position of the lock shell cannot be observed from the outside, the anti-theft performance is good, and disassembly and assembly are convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of locks, and particularly to an anti-drilling lock core. Background Art

[0002] In the field of safety protection of mechanical lock cores, preventing illegal drilling to unlock is one of the key technologies to ensure the security of locks. Traditional mechanical lock cores mostly adopt the method of drilling holes in the lock shell and the lock cylinder and inserting anti-drilling pin shafts. The high hardness property of the pin shafts is used to block the intrusion of the drill bit. In this scheme, the lock cylinder is usually composed of a cover and a cylinder body, with a keyhole and a key slot inside. The anti-drilling pin shafts are fixed in the drilled holes of the lock cylinder by interference fit or welding, forming scattered protection fulcrums around the keyhole. However, this traditional scheme has significant defects: Firstly, the installation of the anti-drilling pin shafts requires high-precision drilling on the lock cylinder, with cumbersome processing procedures and high production costs. Moreover, since the pin shafts are rigidly connected to the lock cylinder, once damaged, the entire lock cylinder needs to be replaced, resulting in high maintenance costs. Secondly, the spacing between the pin shafts forms a protection blind area, and criminals can easily use slender tools to break through the gap. This causes the pin shafts to be unevenly stressed during anti-drilling, and criminals can drill through with a self-tapping screw attack. The anti-drilling effect of the traditional scheme is poor, and the anti-drilling time is short. Thirdly, the keyhole structures of different types of lock cylinders, such as pin tumbler locks and wafer locks, vary greatly. The layout of the anti-drilling pin shafts needs to be designed specifically, and drilling at different positions incurs high processing costs and cannot be universal, restricting the scope of application of the product.

[0003] Currently, there is another anti-drilling lock core on the market. It installs a lock cylinder anti-drilling cover connected to the lock shell directly at the keyhole part of the lock cylinder. However, because this anti-drilling cover is not integrally designed with the lock cylinder and is secondarily connected to the lock shell, criminals can easily carry out disassembly and destruction. Moreover, the anti-drilling cover installed in this way is directly exposed under the lock shell, and criminals can easily identify it as an anti-drilling cover, thus bypassing the anti-drilling cover and cutting into the lock cylinder from the side to damage the lock, with a low safety factor.

[0004] Therefore, how to overcome the above-mentioned defects has become an important issue that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The present invention overcomes the above-mentioned technical deficiencies and provides an anti-drilling lock core.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A drill-proof lock core comprises a lock shell, a lock core is installed in the lock shell, a U-shaped anti-drill piece is inserted on the lock core, the lock core comprises a cover for connecting and sealing with the lock shell and a core body connected to the cover, a slot is provided between the cover and the core body, the U-shaped anti-drill piece is inserted in the slot, the shape of the U-shaped anti-drill piece is adapted to the shape of the slot, a keyhole is provided on the cover, a key slot is provided through the core body, the U-shaped anti-drill piece comprises a connecting portion and a tooth groove portion, the side cross-section of the tooth groove portion has the same shape as the side cross-section of the key slot, and the cross-section of the U-shaped anti-drill piece is U-shaped.

[0008] Furthermore, the cross section of the slot is T-shaped, and the shape of the U-shaped anti-drilling sheet is adapted to the slot.

[0009] Furthermore, the cross section of the slot is elliptical, and the shape of the U-shaped anti-drilling sheet is adapted to the slot.

[0010] Furthermore, the cross section of the slot is square, and the shape of the U-shaped anti-drilling sheet is adapted to the slot.

[0011] Furthermore, the cross section of the slot is a special-shaped rectangle with an inwardly concave arc groove, and the shape of the U-shaped anti-drilling piece is adapted to the slot.

[0012] Furthermore, the lock core is made in one piece.

[0013] Furthermore, the side surface of the U-shaped anti-drilling sheet facing the cover is a smooth surface.

[0014] Furthermore, the U-shaped anti-drilling plate is made of high-speed steel.

[0015] Furthermore, the thickness of the U-shaped anti-drilling sheet is 2mm-5mm.

[0016] Furthermore, the anti-drill lock core also includes a peg, and two of the lock cores are symmetrically arranged with the peg as the axis.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In this case, by setting a U-shaped anti-drilling piece and opening a slot adapted to its shape between the body of the lock cylinder and the cover, the U-shaped cross-section of the U-shaped anti-drilling piece completely wraps the area of the body of the lock cylinder behind the key. The tooth groove part is accurately docked with the key slot entrance, forming a coaxial protection structure from the keyhole to the U-shaped anti-drilling piece and then to the key slot, eliminating the clearance blind area of the traditional pin shaft scheme. At the same time, this structure, compared with the scheme of setting anti-drilling pin shafts in the prior art, through the sheet structure of the U-shaped anti-drilling piece, increases the anti-drilling area, has better anti-theft performance, and is more difficult to be drilled. Secondly, compared with directly setting an exposed anti-drilling cover in the prior art, the U-shaped anti-drilling piece in this case is hidden between the body of the lock cylinder and the cover. After the lock shell is installed, its installation position cannot be observed from the outside, which can effectively hide the anti-theft performance and increase the destruction time of lawbreakers. The connecting part of the U-shaped anti-drilling piece is directly inserted into the slot, without drilling or welding on the lock cylinder, saving installation time. When the anti-drilling piece is damaged or needs to be replaced, only the lock shell needs to be disassembled to quickly replace the anti-drilling piece. The side cross-section of the tooth groove part is the same as that of the key slot, ensuring that the key can be normally inserted to cooperate with the rotation of the lock cylinder; the connecting part is adapted to the shape of the slot, effectively fitting, saving installation space, improving the tightness, realizing the mechanical positioning and force transmission of the anti-drilling piece, and further improving the anti-drilling effect. This case uses the slot to realize the modular installation of the anti-drilling piece, breaking through the limitations of the traditional pin shaft protection, enhancing the universality of the lock core in this case. When facing different key slots or different types of locks, only different U-shaped anti-drilling pieces need to be replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the anti-drilling lock core in this case.

[0020] Figure 2 is a side view of the anti-drilling lock core in this case.

[0021] Figure 3 is Figure 2 a sectional view taken along the A-A direction of

[0022] Figure 4 is one of the schematic structural diagrams of the lock cylinder and the U-shaped anti-drilling piece in this case.

[0023] Figure 5 is another schematic structural diagram of the lock cylinder and the U-shaped anti-drilling piece in this case.

[0024] Figure 6 is the third schematic structural diagram of the lock cylinder and the U-shaped anti-drilling piece in this case.

[0025] Figure 7 is the fourth schematic structural diagram of the lock cylinder and the U-shaped anti-drilling piece in this case.

[0026] Figure 8 is Figure 4 a front view of the side of the U-shaped anti-drilling piece facing the body of the lock cylinder in

[0027] Figure 9 is Figure 5 The front view of the main body surface of the U-shaped anti-drilling piece facing the lock cylinder in [object].

[0028] Figure 10 is Figure 6 The front view of the main body surface of the U-shaped anti-drilling piece facing the lock cylinder in [object].

[0029] Figure 11 is Figure 7 The front view of the main body surface of the U-shaped anti-drilling piece facing the lock cylinder in [object].

[0030] Figure 12 is Figure 8 The right view of the U-shaped anti-drilling piece in [object].

[0031] Figure 13 is Figure 9 The right view of the U-shaped anti-drilling piece in [object].

[0032] Figure 14 is Figure 10 The right view of the U-shaped anti-drilling piece in [object].

[0033] Figure 15 is Figure 11 The right view of the U-shaped anti-drilling piece in [object]. Detailed implementation manners

[0034] The features of the present invention and other related features are further described in detail through the following embodiments for the understanding of those skilled in the same industry:

[0035] Such as Figures 1 to 15As shown in the figure, this case provides an anti-drilling lock core, including a lock shell 1, and a lock cylinder 2 is installed inside the lock shell 1. Specifically, in implementation, the lock shell 1 and the lock cylinder 2 are made of metal materials with high hardness and high strength, such as brass. A U-shaped anti-drilling piece 3 is inserted on the lock cylinder 2. Through the U-shaped sheet structure of the U-shaped anti-drilling piece 3, compared with the original anti-drilling pin shaft matching method, the anti-drilling range is larger and the anti-theft effect is better. The lock cylinder 2 includes a cover 21 for connecting and sealing with the lock shell 1 and a cylinder body 22 connected to the cover 21. A slot 23 is opened between the cover 21 and the cylinder body 22. That is to say, to further improve the anti-theft performance and facilitate the connection between the U-shaped anti-drilling piece 3 and the lock cylinder, the slot 23 is opened between the cover 21 and the cylinder body 22 of the lock cylinder, and the U-shaped anti-drilling piece 3 is inserted into the slot 23. The shape of the U-shaped anti-drilling piece 3 is adapted to the shape of the slot 23. That is to say, the external contour shape of the U-shaped anti-drilling piece 3 is the same as the inner shape of the slot 23 of the slot 23. Through the structural cooperation of the shapes, the quick plug-in installation and positioning are realized. The U-shaped anti-drilling piece 3 can be fixed by axially inserting it into the slot 23 without using additional fasteners for connection and fixation. This split design makes the U-shaped anti-drilling piece 3 an independent and replaceable part. If the U-shaped anti-drilling piece 3 is damaged or scratched, only need to replace it separately, and the main body of the lock cylinder 2 can still be used continuously, avoiding the overall scrapping of the lock core, which is beneficial to cost saving. A keyhole 211 is opened on the cover 21, and a key slot 221 is penetrated through the cylinder body 22. Among them, the keyhole 211 provides an insertion port for the key for the user, and the key slot 221 enables the user to drive the lock cylinder 2 to rotate by turning the key through the tooth groove cooperation with the key, so as to effectively realize unlocking. The U-shaped anti-drilling piece 3 includes a connecting portion 31 and a tooth groove portion 32. The side cross-section of the tooth groove portion 32 is the same as the side cross-section of the key slot 221. That is to say, the U-shaped anti-drilling piece 3 can be understood as an extended part of the key slot 221 of the lock cylinder 2, and the internal tooth groove structure of its internal tooth groove portion 32 is the same as that of the key slot 221, for the user to insert the key and rotate the lock cylinder 2. The keyhole 211 and the key slot 221 are coaxial to ensure that the tooth groove portion 32 of the U-shaped anti-drilling piece 3 accurately covers the entrance of the key slot 221, forming a continuous protection barrier, which can effectively prevent criminals from directly invading the lock cylinder from the keyhole 211 using tools such as drills. The cross-section of the U-shaped anti-drilling piece 3 is U-shaped. That is to say, the side shape of the U-shaped anti-drilling piece 3 in this case is always a U shape, so that it can be adapted to most lock cylinders 2 on the market. Different tooth groove portions 32 are set according to different types of lock cylinders 2 so that the tooth groove portion 32 is adapted to the key slots 221 of different lock cylinders 2. When the U-shaped anti-drilling piece 3 of this case needs to be installed on different lock cylinders 2, there is no need to modify the internal structure of the lock cylinder 2, only need to replace the U-shaped anti-drilling piece 3 with the corresponding tooth groove portion 32, which is convenient for installation and replacement and saves costs.

[0036] Such as Figure 4 、 Figure 8, Figure 12 As shown, as the preferred embodiment in this case, the cross-section of the slot 23 is T-shaped, and the shape of the U-shaped anti-drilling piece 3 is adapted to the slot 23. The T-shaped structure disperses the impact force during drilling by the drill bit to the whole of the cover 21 and the lock body 22, avoiding the cracking of the slot caused by single-point stress, and prolonging the service life of the U-shaped anti-drilling piece 3 and the lock core in this case.

[0037] In another embodiment, as Figure 5 , Figure 9 , Figure 13 shown, the cross-section of the slot 23 is oval, and the shape of the U-shaped anti-drilling piece 3 is adapted to the slot 23.

[0038] In another embodiment, as Figure 6 , Figure 10 , Figure 14 shown, the cross-section of the slot 23 in this case is square, and the shape of the U-shaped anti-drilling piece 3 is adapted to the slot 23.

[0039] In another embodiment, as Figure 7 , Figure 11 , Figure 15 shown, the cross-section of the slot 23 is a special-shaped rectangle with an inward concave arc groove 231, and the shape of the U-shaped anti-drilling piece 3 is adapted to the slot 23. The cross-section of the slot 23 is a special-shaped rectangle with an inward concave arc groove 231, and the inward concave radian can be designed according to the shape of the adapted lock body 2. The side of the U-shaped anti-drilling piece 3 is provided with a corresponding inward concave arc groove 231 to form a tightly fitting structure with convex-concave engagement. The inward concave radian can avoid the pin holes or blade grooves inside the lock body 2 and is compatible with multi-track key structures, such as mother-and-child bead pin tumbler locks. Secondly, this special-shaped structure makes the cooperation between the U-shaped anti-drilling piece 3 and the slot 23 closer, and the anti-drilling and anti-theft effects are better.

[0040] As described above, the cross-section shapes of the slot 23 shown in this case include T-shaped, oval, square, and special-shaped rectangle, and the shape of the U-shaped anti-drilling piece 3 is adapted to the slot 23. Through the structural cooperation, the shape of the connecting part 31 between the slot 23 and the U-shaped anti-drilling piece 3 is closely fitted, so as to form a mechanical positioning pair between the slot 23 and the U-shaped anti-drilling piece 3, ensuring the axial fixation of the U-shaped anti-drilling piece 3 and no circumferential shaking. When resisting the drilling of the drill bit, it can play a good anti-drilling effect and improve the anti-theft performance of the lock core in this case.

[0041] Furthermore, the lock body 2 is integrally formed. That is to say, the cover 21 and the lock body 22 are made by an integral forming process, and the slot 23 is formed synchronously during the forming process without splicing gaps, improving the overall hardness of the lock body 2 and facilitating assembly production.

[0042] Furthermore, the side of the U-shaped anti-drilling piece 3 facing the cover 21 is a smooth surface. During specific implementation, the side of the U-shaped anti-drilling piece 3 facing the cover 21 is polished through precision grinding in metal processing, thereby reducing the friction between the smooth surface of the U-shaped anti-drilling piece 3 and an object. When an illegal person uses a drill bit or a self-tapping screw to unlock illegally, the drill bit or the self-tapping screw is likely to slide and shift when contacting the smooth surface of the U-shaped anti-drilling piece 3, and it is impossible to stably position and drill, greatly improving the anti-theft performance.

[0043] Preferably, the U-shaped anti-drilling piece 3 is made of high-speed steel material. Through heat treatment of the high-speed steel material and then electroplating and hardening treatment, the hardness of the U-shaped anti-drilling piece 3 is made greater than that of the commonly used drill bits and self-tapping screws, and it can effectively resist illegal unlocking by illegal persons.

[0044] The thickness of the U-shaped anti-drilling piece 3 in this case is 2 mm - 5 mm. During specific implementation, in this case, considering the compatibility cost and the structure of the lock cylinder 2, and at the same time being able to achieve a good anti-drilling effect, preferably, the thickness of the U-shaped anti-drilling piece 3 is set to 2.5 mm.

[0045] As Figures 1 - 3 shown, furthermore, the anti-drilling lock core further includes a dial 4, and two of the lock shell 1 and the lock cylinder 2 are symmetrically arranged left and right with the dial 4 as the axis. That is to say, the anti-drilling lock core in this case is a double-lock-cylinder double-opening lock core, with lock cylinders 2 provided at both ends, and keys can be used to open the door on both sides.

[0046] As described above, what this case protects is an anti-drilling lock core, and all technical solutions identical or similar to this case should be regarded as falling within the protection scope of this case.

Claims

1. An anti-drilling lock core, comprising a lock housing (1), wherein a lock cylinder (2) is installed inside the lock housing (1), and is characterized in that: A U-shaped anti-drilling piece (3) is inserted into the lock cylinder (2). The lock cylinder (2) includes a cover (21) for connecting and sealing with the lock shell (1) and a cylinder body (22) connected to the cover (21). A slot (23) is formed between the cover (21) and the cylinder body (22). The U-shaped anti-drilling piece (3) is inserted into the slot (23). The shape of the U-shaped anti-drilling piece (3) is adapted to the shape of the slot (23). A keyhole (211) is formed on the cover (21), and a key groove (221) is formed through the cylinder body (22). The U-shaped anti-drilling piece (3) includes a connecting portion (31) and a tooth groove portion (32). The cross-sectional shape of the tooth groove portion (32) is the same as the cross-sectional shape of the key groove (221). The cross-section of the U-shaped anti-drilling piece (3) is U-shaped.

2. The anti-drilling lock core according to claim 1, characterized in that: The cross-section of the slot (23) is T-shaped, and the shape of the U-shaped anti-drilling piece (3) is adapted to the slot (23).

3. The anti-drilling lock core according to claim 1, characterized in that: The cross-section of the slot (23) is oval, and the shape of the U-shaped anti-drilling piece (3) is adapted to the slot (23).

4. The anti-drilling lock core according to claim 1, characterized in that: The cross-section of the slot (23) is square, and the shape of the U-shaped anti-drilling piece (3) is adapted to the slot (23).

5. The anti-drilling lock core according to claim 1, characterized in that: The cross-section of the slot (23) is a special-shaped rectangle with an inner concave arc groove (231), and the shape of the U-shaped anti-drilling piece (3) is adapted to the slot (23).

6. The anti-drilling lock core according to claim 1, characterized in that: The lock cylinder (2) is integrally formed.

7. The anti-drilling lock core according to claim 1, characterized in that: The side surface of the U-shaped anti-drilling piece (3) facing the cover (21) is a smooth surface.

8. The anti-drilling lock core according to claim 1, characterized in that: The U-shaped anti-drilling piece (3) is made of high-speed steel material.

9. The anti-drilling lock core according to claim 1, wherein: The thickness of the U-shaped anti-drilling piece (3) is 2 mm - 5 mm.

10. A drill-proof lock core according to any one of claims 1-9, characterized in that: The anti-drilling lock core further includes a pick (4). Two lock shells (1) and lock cylinders (2) are symmetrically arranged on the left and right with the pick (4) as the axis.

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